How clever is the S3 ECU in respect of mapping and adjusting correctly for mods?

I've modified a few previous car now to around 300bhp and they have all been different in the respect of mapping specifically for modifications.

As an example I bought a standard Focus ST225, got it mapped on the day I bought it by a company called Pumabuild (their own map) then bit by bit I added firstly a 3" cat back system, then a month or two later a CAIS, followed next month by an uprated intercooler and sports cat downpipe. At no point was the original map changed and on a rolling road the car produced 310bhp and 350lb/ft with as perfect power/boost/fueling graphs as you could possibly get. The very clever ECU in the Focus adjusted everything to optimum based on the readings from all the sensors.

Then... lets take my 2006 Impreza, every major modification you added had to have the map tweaked to suit or you got all sorts of overboosting, fuelling and other problems. You actually had to drive it off boost to the mappers to have it tweaked.

So the Audi S3... on Saturday I'm getting it shark stage one mapped by Brodster. It's bog standard just now but lets say in a months time I want to add an intake system, then the following month I want to add a turbo back exhaust. Can I safely add these things without having to go back and immediately have it mapped again? Will the ECU account for these and adjust what it needs to to run the car safely now the whole system is far more free flowing?

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Happy to be corrected mate but as far as I'm aware, taking your examples into consideration, your cold air intake will be fine and your turbo back will be as well providing it's got a 200cel sports cat. EML will come on for the emissions if it's decat or only a 100cel sports cat.

Regional RepVCDS Map User

As said mate........no harm in doing it the way you want to do it. I did exactly the same with no adverse effects to the car. And when the time comes to get it remapped again say after the TBE fit its only an update to the map so minimal expense NOT full map price.

Staff MemberModeratorTeam Brill RedBlack Edition

I did exactly the same in my car,it seemed quicker but when the map was put on to use all this hardware boy oh boy,night and day but worth the wait to appreciate it,stage one will have you grinning though.

Been wondering this myself. My plan is to now do, catback, CAI and stage 1 map, ill probably leave it after that! Expecting around 320BHP+ since stock mines pushing 280.

Edit: After doing some Youtubing ive realised the Milltek catback non res doesnt sound much different to the stock exhaust... so i might save for a Turboback... since that definatly sounds different

I was under the impression though that with a TBE you needed to have a stage 2 map, which is what the Milltek site says? Not going to make much difference to me if i need it anyway as id already have a Shark stage 1!!

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